Providing Keys: Here, you can provide the keys for
your accounts manually. All you need to do is add the wif
keys for the accounts you want to use as a simple array
using the keys parameter to PeerPlays().

Force keys: This more is for advanced users and
requires that you know what you are doing. Here, the
keys parameter is a dictionary that overwrite the
active, owner, posting or memo keys for
any account. This mode is only used for foreign
signatures!